Rolls-Royce Cullinan Series II airbag control unit repair

What is a Rolls-Royce Cullinan Series II airbag control unit?

In the Rolls-Royce Cullinan Series II, the airbag control unit is the central control unit of the restraint system (SRS), because it evaluates the signals from the crash sensors and, in an emergency, decides within milliseconds which airbags and seatbelt pretensioners fire. At the same time, it continuously monitors the condition of the entire system and makes faults visible via the airbag warning light.

The control unit is fitted in the since 2024 model series, and depending on equipment and year of manufacture the Rolls-Royce Cullinan Series II may come with different versions. The electronics work in the background and only become noticeable in everyday use when the warning light indicates a fault.

If an accident occurs, the unit stores crash data and then locks itself. For this reason the light often stays on after an accident, even if the vehicle looks perfectly fine on the outside.

Why is the Rolls-Royce Cullinan Series II airbag control unit defective?

Most often the cause is crash data stored in the unit after an accident, even if no airbag deployed. Ageing electronic components, cold solder joints, moisture with corrosion on the connectors and voltage spikes are other possible causes.

A standard diagnostic tool cannot remove the stored crash data. The fault therefore remains, even if you reset the fault memory several times. Without repairing the unit itself, nothing will change.

Regardless of an accident, electronic components age over time, solder joints can become cold and brittle, and moisture causes corrosion on connectors with increased contact resistance. Voltage spikes, such as those caused by a weak battery or jump-starting, put additional strain on the circuits.

Typical signs are a permanently lit airbag warning light, a fault memory that cannot be cleared, and a diagnostic tool that cannot establish a connection at all.

Common error codes for Rolls-Royce Cullinan Series II airbag control unit repair

The error codes in the Rolls-Royce Cullinan Series II show in which part of the restraint system a fault is present. For this vehicle they relate to occupied crash data and one squib circuit, namely that of the front passenger airbag.

We know the following error codes for this vehicle:

• 91 → Crash memory in restraint system occupied
• 33 → Front passenger airbag circuit interrupted or high resistance

Error codes are read out with a diagnostic tool. Note that a single code does not yet prove that the control unit is defective, because connectors, wiring or an airbag module can equally trigger the entry. Only the inspection shows where the cause actually lies.

What part numbers are available for the Rolls-Royce Cullinan Series II airbag control unit repair?

You will find the part number on the label of the control unit; it belongs to the Rolls-Royce Cullinan Series II and defines the exact version. Depending on equipment and year of manufacture, the numbers differ within a model series.

Read the number directly from the label, because you enter it in the repair order.

Whether your unit is defective only becomes clear when the fault memory is read out or during the inspection; the number alone says nothing about this.

For the repair, proceed as follows: first have the fault memory read out, disconnect the battery and remove the control unit. Then create a repair order online and send the unit to us. Checking, repairing and testing at Airbag24 usually take 3–4 working days, and exactly the unit you sent in is returned.

The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.